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(No Model.)

O. T. JACKSON.

ELEGTRIUBURGLAR ALARM.

No. 269,862. Patented Jan, 2, 1883.

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UNrrED STATES,

PATENT FFICE.

CHARLES TEMPLE JACKSON, OF NEW YORK, N; Y.

ELECTRIC BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 269,862, dated January2, 1883.

(No model.)

To all whom it may concern:

Be it known that 1, CHARLES TEMPLE JAcK- SON, ofthe city, county, andState ot'New York, have invented an Improvement in ElectricBurglar-Alarms, of which the following is a specification.

This invention belongs to that class of ap-' paratus commonly termedelectric burglaralarms, and is designed to automatically give warning ofthe opening or breaking in of a window or door, as the case may be, bythe ringing of an electric hell or equivalent sounding device, broughtabout by electric agency set in operation by the movement of the door orwindow, as the case maybe; and it comprises certain novel combinationsof parts, whereby is provided a very simple and effective alarm, capableofbeing made and applied at a low cost, and consequently within thereach of a large portion of the community to whom the expensive electricburglar-alarms as hithertoin use have been practically unavailable.

Figure l is a diagram illustrating the construction and operation of mysaid invention. Figs. 2 and 3 are detail views representing certainparts of the mechanism embraced in my said invention.

The apparatus is designed to be operated on a circuit comprising asingle wire, as distinguished from the duplicate wires heretofore in usein the class of apparatus to which my said invention belongs.

Having reference to the accompanyingdrawings, the construction andoperation of the apparatns areas follows:

K is a battery of any ordinary or suitable construction; but in practicean ordinary sulphateoficopper batteryof three or i'ourcells will besufficient for the burglar-alarms of an ordinary dwelling. The current,having its inception at the pole K of the battery K, tollows the wire Kto the point a; thence through the wire a (shown in dotted outline inFig. 1) to the metallic conducting-standard B, whence it passes to thearm b of the armature U, pivoted at c to the upright D, the currentpassing from the said arm I; to the said upright D, the latter being ofmetal of suitable conductivity, the current then passing from saidsupport D through the wire (1 (shown partly in dotted outline in Fig. 1)to and around the electro-magnets E,

ducted by a wire, G, to a fixed stud, g. placed below what I term anelectric catch,z, the said catch being substantially a contact-spring,which, when pressed downward in contact with the stud g, connects withthe wire G, and there-- by transmits the current to the wire I, which iscarried around to the pole J of the battery K, the said pole J being ofcourse the pole opposite to the pole K, from which the current started.

The catch or spring 2 is attached to the sash H of the window. so thatwhen the latter is depressed the catch or spring 2 is pressed downwardupon the stud g, so that the circuit is continuous or unbroken throughthe several wires and conductors hereinbei'ore described, from the poleK of the battery around to the pole J thereof, this circuit beingconstant and continuous when the window is closed in relation to thecatch or spring 2 and wires I and G, as hcreinbefore explained.

The object of the upright B is to avoid the necessity of carrying wiresdirect to the upright I), the arm b being brought in contact with thesaid upright Dwhen-the armature itself is brought down upon theelectro-magnet E.

In order that the armature may be brought within range of theattracrion'of the elecrromagnet E, its free arm or extremityis providedwith a button, y, by pressing down upon which the armature will bebrought in contact with the magnet and the arm I) in contact with theupright D. The connection beingestablished, as just described, thecurrent flows, as hereinbefore explained, the arm being held down bymagnetic attraction upon the magnet E, and in this case there is noconnection with the electric bell shown at l, the bell, apart from thecombination in which I employ it, being well known, and consequentlyrequiring no specific description here. When the window H is raised thecatch or spring z rises by its own elasticity away from the stud g, andconsequently breaks the circuit hereiubefore described, whereupon thesaid current is caused to pursue a different circuit, which brings the 1bell into operation. The same results follow it any of the wires formingpart of the herein-' I before described circuit are severed or broken.The cessation of the current through the circuit hereinbefore describeddemagnetizes the magnet E, whereupon the arm b of the arma tureiswithdrawn from the upright D by means of a spring, h, which causes theopposite end of the armature. to rise and come in contact with the lowerend of an adjustable screw, N, which forms part of theconducting-upright M, which connects, through a wire, R, post 0, andwire R, with the bell mechanism at P, from which latter the current isconducted through a wire, S, to the pole J of the battery. A wire,T,extends from the pole K of the battery to a post, L, from whichextends a wire, U, to the upright D, so that the current passes lrom thepole K of the battery to the post L, and follows the wile U, u 'irightl), armature U, post M, wire 1%, post 0, wire R,and thence through thebell mechanism P, through the wire S, back to the battery, which saidbell continues to ring so long as the current remains on this circuit-inother words, so long as the wire of the first circuit remains broken orsevered, or operatt d by the lifting of the window or otherwise.

It is of course to be understood that the spring or catch z and the studg or adjacent end of the wire Gr may be arranged in such relation with adoor that the opening of the door will release the stud or spring,thereby breaking the tirst or silent circuit and throwing the currentinto the second or signal circuit, through which the bell mechanism P orlike sounding mechanism is actuated.

Vhat I claim as my invention is In an electric burglar-alarm, thecombination of a battery, K, and wire K extended from one polethereof toa conducting-upright, B, a conducting-standard, I), connected by a wire,a), with the electro-magnet E, the armature U, pivoted to the standardD, and having an arm, 1), arranged coincident with the upright B, aspring, h, for attracting the arm b from the upright B, a wire or wires,U '1, connecting the upright D with the pole K of the battery, astandard, M, arranged coincident with the outer or free arm of thearmature O, and connected by a wire or wiles, R R, with an electric hellor sounding apparatus, P, a wire, S, connecting said sounding apparatuswith the pole J of the battery, a wire or wires, 00 G, extending fromthe electro-magnet to the frame of the door or window, and having itsextremity forming a stud or contact part, {1, a spring or catch, .2,coincident with the sash H of a window, or with the correspondingportion of a door, as the case may be, and also coincident with the studor terminal point g of the wire G, and the wire I, extending from thespring or catch 2' to the pole J of the battery, the whole constructed,combined, and organiZed for joint use and operation substantially as andfor the purpose herein set forth.

CHARLES TEMPLE JACKSON.

Witnesses:

THOMAS E. OROSSMAN, RUDoLF H. BJILLMAN.

